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    <script>
      /*
      slice() 方法返回一个新的数组对象 不影响原始
    */
      (function () {
        const animals = ['a', 'b', 'c', 'd', 'e'];
        console.log(animals.slice(2)); //['c', 'd', 'e']
        console.log(animals.slice(2, 4)); // ['c', 'd']
      })();
    </script>
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